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Abstract

The position of a carriage on a track is determined within coarse position zones by means of a fine position transducer of the type employing a microwave source and waveguide in conjunction with a magnet. In this system a curved waveguide is mounted on the carriage and has a linear portion equal to the zone length. A stationary magnet arrangement through which the waveguide passes is mounted alongside each zone. The curve in the waveguide allows the bulky microwave source to pass over rather than through the magnet arrangement. As best shown in section in Fig. 3, carriage 10 is supported for movement along a box section track 11 by bearings 12. The carriage drive is not shown but may, for example, be a linear induction motor as described in a previous article [*].

Country

United States

Language

English (United States)

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Carriage Position System

The position of a carriage on a track is determined within
coarse position zones by means of a fine position transducer of the
type employing a microwave source and waveguide in conjunction with a
magnet. In this system a curved waveguide is mounted on the carriage
and has a linear portion equal to the zone length. A stationary
magnet arrangement through which the waveguide passes is mounted
alongside each zone. The curve in the waveguide allows the bulky
microwave source to pass over rather than through the magnet
arrangement. As best shown in section in Fig. 3, carriage 10 is
supported for movement along a box section track 11 by bearings 12.
The carriage drive is not shown but may, for example, be a linear
induction motor as described in a previous article [*]. In order to
measure and control the position of the carriage, coarse and fine
position measurement systems are provided. As shown in the side and
plan views of Figs. 1 and 2, the coarse system divides the track into
zones whose boundaries are indicated by dotted lines 15. Each zone
is identified by coded flags 16 which are read by means of an optical
flag reader 17 mounted on the carriage. According to the system of
coding, one flag changes at each boundary 15. Within each zone, fine
position is measured by means of an electromagnetic waveguide
position transducer system in which a microwave source transmits a
reference microwave down a waveguide. This microwave is reflected by
...